It shall be unlawful for any person who receives any payment under section 9006, or to whom any portion of any payment received under such section is transferred, knowingly and willfully to use, or authorize the use of, such payment or such portion for any purpose, other than to repay loans the proceeds of which were used, or otherwise to restore funds (other than contributions to defray qualified campaign expenses which were received and expended) which were used, to defray such qualified campaign expenses.